Regarding Lawless's character, executive producer Maurissa Tancharoen revealed to Comic-Con attendees, "She's tough. She may have a knife that's always by her side." Her character will be an experienced S.H.I.E.L.D. veteran.

Other new additions include the thusfar unknown British actor Nick Blood and Reed Diamond (Homicide: Life on the Street). Blood will be playing a mercenary whose help is Enlisted by Gregg's character, Agent Phil Coulson, and Diamond will play, as executive producer Jed Whedon calls him, "one of our Hyda baddies."

At this time, no information on the length of Lawless's appearance on the second season of ABC's series has been confirmed.

"Marvel's Agents of S.H.I.E.L.D.," a dynamic, action-packed one-hour drama, showcases Agent Phil Coulson and his team of highly skilled agents as they investigate extra-normal and super human people and events worldwide. Soon after the battle of New York, the existence of super heroes and aliens became public knowledge, and the world was trying to come to grips with this new reality. With new threats on the horizon, Coulson's small, highly select group of Agents from the worldwide law-enforcement organization known as S.H.I.E.L.D. (Strategic HomelandIntervention Enforcement and Logistics Division) investigate the new, the strange and the unknown around the globe, protecting the ordinary from the extraordinary.